Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 9.8" Diameter x 9.5" Pitch Right-Hand Rotation 3 Blades Aluminum High-Gloss Black Finish QA2192R. Overview. There is a familiar comfort in knowing your boat responds exactly how you expect - smooth throttle, steady lift, and a quiet hum that tells you everything's working in sync. That's what you get with the Quicksilver Black Diamond 3-Blade Aluminum Propeller. It's not flashy or overcomplicated - just solid, dependable performance